i have lost 7 pounds after stomach virus. How can i maintain this loss why reintroducing foods?

I have been on weight watchers for 5 months and have so far lost 22 pounds.  I have also been exercising regularly and living a healthy life style.

 I have been suffering from the stomach virus for 3 days and lost about 7 pounds.  How can I maintain this loss while reintroducing food in to my diet?  I need to continue on the weight loss.  Help..